Machine for grubbing sage-brush.



PATENTED OCT. 24, 1905.

A. L. DUNAVAN. MACHINE FOR GRUBBING SAGE BRUSH.

APPLIOATION FILED $313.21. 1905.

Inventor Witnesse Attorneys Tl TTE STATES PATENT ()FFIE.

Specification of Letters Patent.

Patented Oct. 24, 1905.

Application filed February 21, 1905. Serial No. 246,760-

.Zo all whom, it may concern.-

Be it known that I, ALoNzo L. DUNAVAN, a citizen of the United States,residing at Izee, in the county of Grant and State of Oregon, haveinvented a new and useful Machine for Grubbing Sage-Brush, &c., of whichthe following is a specification.

This invention relates to machines for grubbing sage-brush and otherobnoxious weeds and plants of a like nature; and it has for its objectto provide a device of this class which shall possess superioradvantages in point of simplicity, durability, and general efficiency.

With these and other ends in view, which will readily appear as thenature of the inven' tion is better understood, the same consists in theimproved construction and novel arrangement and combination of parts,which will be hereinafter fully described, and particularly pointed outin the claims.

In the accompanying drawings has been illustrated a simple and preferredform of embodiment of the invention, it being, however, understood thatno limitation is necessarily made to the precise structural detailstherein exhibited, but that the right is reserved to any changes,alterations, and modifications to which recourse may be had within thescope of the invention and without departing from the spirit orsacrificing the efficiency of the same.

In said drawings, Figure 1 is a top plan view of a grubbing-machineconstructed in accord ance with the principles of the invention. Fig. 2is a side elevation of the same, the near wheel having been removed.Fig. 3 is a vertical sectional view taken on the line 3 3 in Fig. 1.Fig. 4 is an enlarged perspective, partly in section, showing a portionof the grubbing-roller and related parts. Fig. 5 is an enlargedsectional view of the grubbingroller.

Corresponding parts in the several figures are indicated throughout bysimilar characters of reference.

A rectangular frame, comprising the side pieces 1 1, front piece 2, andrear piece 3, supports the side members l t of a tongue 5, said sidemembers converging forwardly in the usual manner. Suitably attached tothe under sides of the frame-pieces 1 1 and side members 4 1 areaxle-stubs 6, carrying the transporting-wheels 7. In rear of theseaxle-stubs and partially braced thereby are brackets 8 8, which dependfrom and are connected with the side members 1 1 of the frame and whichare sustained by auxiliary-braces 9, connecting the front and rear sidesof said brackets with the under sides of the side frame-pieces 1.

The brackets 8 carry upon their lower front ends boxes or bearings 10for a cylinder-shaft 11, said boxes or bearings being secured in part bymeans of the bolts 12, which secure the lower ends of the braces 9 tothe brackets 8, and partly by means of hook-bolts 13, which serve forthe attachment of the draft.

Mounted eccentrically upon the'shaft 11 is a cylindrical member 14,which is termed the grubbing-cylinder. Said cylinder is provided withtransverse sockets, as 15, of approximately triangular shape, for thereception of the inner ends of teeth, as 16, which said teeth are ofapproximately rhomboidal shape,termi nating at their front ends in sharppoints 17 and at their rear ends in screw threaded shanks 18, whichprotrude upon the back of the roller for the reception of nuts 19,whereby the said teeth will be secured firmly in position.

The grubbing-cylinder is provided with a plurality of earth-engagingpins 18, having screw-threaded inner ends and provided with squaredouter ends 19*, adapted to be engaged by a suitably-constructed Wrench,whereby the said pins may be screwed into the body of the roller. Theseearth-engaging pins are to be secured at suitable distances apart aroundthe circumference of the cylinder, and their inner ends are disposed inengagement with opposite sides of the rubbing-teeth, thus assisting insecuring the latter and also preventing inward displacement of the saidpins.

The ends of the eecentrically-mounted cylinder are provided with collars21, having radially-extending lugs 22, said lugs at the two ends of theroller being in alinement with each other and adapted to be engaged bylatches 23, which are pivotally secured to the inner sides of thebrackets 8. These latches, which are in the form of elongated leversprovided with engaging members at their front ends, are connected, bymeans of links 2 1, with arms 25, extending from a rock-shaft 26,whichis suitably supported in the frame of the machine and which is providedwith a foot-piece or treadle 27, adapted to be manipulated by theoperator, whose seat 30 is mounted upon a platform 29, disposed betweenthe diverging rear ends of the tongue-bars, as best seen in Fig. 1.

The operation of this device will be readily understood from theforegoing description,

taken in connection with the drawings hereto l annexed. When the lugs 22are in engagement with the latches 23, the teeth of the cylinder willpoint downwardly and forwardly, so as to engage the ground, and when themachine is hauled over the ground the teeth of said cylinder will diginto the soil and uproot the vegetation with which they come intocontact. The uprooted plants or weeds will be dragged along with themachine until a suflicient quantity has been accumulated, when, byoperating the foot-lever, the driver will release the cylinder andpermit the latter to revolve upon the axis of the shaft 11, thus causingthe teeth to be disentangled from the brush and weeds engaged thereby,and the several earth-engaging pins upon the roller will, by engagingthe surface of the soil, force the cylinder to rotate and to becomedisengaged from the brush and weeds, which are left behind. The driverin the meantime has restored to their normal position the latches 23,which will presently be engaged by the lugs 22, thereby stopping furtherrotation of the cylinder and causing the teeth to again engage the earthfor a repetition of the operation.

The cylinder has been shown mounted eccentrically; but this is notessential, and it may be concentric with its supporting-shaft, ifpreferred.

By placing the hooks for the attachment of the draft upon the boxes inwhich the cylinder-carrying shaft is journaled it is obvious that thedraft is directly applied to the ends of the cylinder, thereby achievingmuch better results than if the draft were attached at any other pointof the machine.

To prevent the cylinder, which is intended to be made of wood, fromsplitting or becoming otherwise damaged, the said cylinder is reinforcedby means of longitudinal strips or bars 34 34 and 35, the latter ofwhich is slotted for the passage of the teeth 16,.Which are thereby verymaterially braced. I have also in order to increase the strength andeffectiveness of the device provided the latch members 23 with heads, as36, which are of a width equal to the width of the lugs 22, with whichthe said latch members cooperate. If preferred, the latch members may betapered to the desired width; but these and other details ofconstruction may be varied within the scope of the invention.

Having thus described the invention, what is claimed is- 1. In a machineof the class described, a member supported for rotation and having atriangular recess, a rhomboidal tooth mounted in said recess, and meansfor connecting said tooth with said rotary member.

2. In a machine of the class described, a member mounted for rotationand having earth engaging teeth, and earth engaging pins connected withsaid member and engaging the teeth at their inner ends.

3. In a machine of the class described, a member mounted for rotation, asingle row of ground-engaging teeth connected with said member andhaving shanks forming groundengaging pins extending from the oppositeside of the member, and means for securing said teeth includingground-engaging pins inserted into opposite sides of the rotary memberand abutting upon the teeth.

4. In a machine of the class described, a toothed member mounted forrotation and having radially extending earth engaging pinsscrew-threaded at their inner ends and squared at their outer ends toform wrenchseats.

5. In a machine of the class described, a member supported for rotationand having sockets, teeth in said sockets having shanks extendingthrough the opposite side of the rotary member and provided withgroundengaging points, and reinforcing-bars connected with said rotarymember; one of said reinforcing-bars being provided with slots for thepassage of the teeth.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in the presence of two witnesses.

ALONZO L. DUNAVAN.

Witnesses:

OWEN KURINs, LOTTIE F. GARsoN.

